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You could run them, but as mentioned above it would be better to run a slightly more narrow tire. It would be more trouble free with four fronts, but with enough work you could possibly run the rears as well.

I managed to find a place where they can do this kind of thing here in SA. They advised that the rear wheel has to be re-engineered - they fit the wheel on the car (without the tyre), then do the measurements (it sticks out approx 20mm). They will now cut the inside of the wheel hub to make the 20mm space, re-weld & then drill out new holes. They claim it will work 100%....they have done this before on a 330ci. It takes about 2 weeks to prepare the wheel....I will send you pictures once it has been done. Hopefully it works out ok as they claim.

I managed to find a place where they can do this kind of thing here in SA. They advised that the rear wheel has to be re-engineered - they fit the wheel on the car (without the tyre), then do the measurements (it sticks out approx 20mm). They will now cut the inside of the wheel hub to make the 20mm space, re-weld & then drill out new holes. They claim it will work 100%....they have done this before on a 330ci. It takes about 2 weeks to prepare the wheel....I will send you pictures once it has been done. Hopefully it works out ok as they claim.

PS: No problems with the front wheels.

Widening and narrowing wheels is fairly common, but I would be careful about shaving off bits of the wheel back pad. It could alter the structural integrity of the wheel since that's the first place that weight will be distributed. If you shave off about 20mm, I'm guessing you'd be left with about 5mm of metal to mount to your car.

I managed to find a place where they can do this kind of thing here in SA. They advised that the rear wheel has to be re-engineered - they fit the wheel on the car (without the tyre), then do the measurements (it sticks out approx 20mm). They will now cut the inside of the wheel hub to make the 20mm space, re-weld & then drill out new holes. They claim it will work 100%....they have done this before on a 330ci. It takes about 2 weeks to prepare the wheel....I will send you pictures once it has been done. Hopefully it works out ok as they claim.

PS: No problems with the front wheels.

I think they test fitted the rear wheels incorrectly.

I don't think OEM 19x9.5 et27 wheels are going to stick out 20mm past the fender. (Sounds like they just jacked the car up, put the M3 wheel on and saw that it stuck out 20mm while the suspension was drooped/unloaded, lol)

And why mill the back pad when you can fit the wheel with slightly narrower tires and rolled fenders? This has already been done on a sedan, search for DTMdan.